As climate change accelerates ice melt and sea levels continue to rise, scientists warn that global warming jeopardizes our cultural heritage. They found that a rise in global temperatures of just over 5 degrees Fahrenheit would threaten 20 percent of UNESCO World Heritage Sites.

Trapped underneath the Greenland ice sheet is a massive reservoir of melt water, according to new analysis of the frozen landscape. The discovery could help us better understand the future of global sea-level rise.